Activated Carbon Decolorization Guide | ACC Activated Carbon Supplier

{"news_id":8763,"is_preview":0,"news_info":{"id":8763,"company_id":176,"user_id":411,"author":"","website_id":781,"pub_date":"2024-03-14 10:42:58","urla":"activated-carbon-decolorization-guide","description":"What should we pay attention to when using activated carbon for decolorization? Why shouldnt you use too much activated carbon for decolorization?","image_url":"https:\/\/oss.matchpages.cn\/matchpages\/common\/2024\/0314\/4856\/65f265b84f7e6\/activated-carbon-Catalyst-for-Glyphosate--1-.webp","image_alt":"Activated Carbon Decolorization Guide","title":"Activated Carbon Decolorization Guide","content":"<h1 style=\"line-height: 1.6;\"><strong>Activated Carbon Decolorization Guide<\/strong><\/h1>\n<h2 style=\"line-height: 1.6;\"><strong><span style=\"color: #169179; font-size: 14pt;\">1) Determination method of decolorization power:<\/span><\/strong><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(1) First prepare the Yalan standard solution that you need to use. There are two commonly used ones at present, 1.5g\/l and 1.8g\/l. Choose the standard solution according to your own needs;<\/span><br \/><span style=\"color: #333333;\">(2) Then prepare a 10 ml straw and a 50 ml tapered cup;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(3) Weigh 0.1g of activated carbon and place it in a tapered cup;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(4) Then use a pipette to suck up the alan standard solution, and determine how many milliliters to draw;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(5) Then pour the standard solution into the tapered cup, and then stir thoroughly for about 10-15 minutes;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(6) Finally, filter the stirred solution with filter paper, and judge the decolorization rate of activated carbon according to the color of the filtered water;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(7) It is best to use a oscillator when stirring, so that it is more uniform and the measurement results are better and more accurate!<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(8) If the alan concentration is 0.15, it should be 240mg\/0.1g<\/span><\/p>\n<h2 style=\"line-height: 1.6;\"><strong><span style=\"color: #169179; font-size: 14pt;\">2) What issues should be paid attention to when using activated carbon for decolorization?<\/span><\/strong><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(1) The general operating temperature of activated carbon is 75-80 degrees;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(2) The decolorization effect of activated carbon is strongest in water, and it is also effective in strong polar solvents, but less effective in non-polar solvents;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(3) Generally, it is better to use it under pH 3-6 conditions;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(4) Under normal circumstances, the added amount is one to three thousandths;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(5) The decolorization time is generally 30-60 minutes;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(6) There are many types and models of activated carbon, such as sugar carbon, oil carbon, etc. You should choose an activated carbon suitable for your use;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(7) Do not add activated carbon to the boiling solution, as there is a risk of boiling;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(8) When using activated carbon for decolorization, the solid matter must be completely dissolved before adding it. Although colored impurities are soluble in boiling solvents, when the crystals are precipitated by cooling, some of the impurities will be adsorbed by the crystals, causing the product to be colored, so use Activated carbon for decolorization should be added after the solid matter is completely dissolved.<\/span><\/p>\n<h2 style=\"line-height: 1.6;\"><strong><span style=\"color: #169179; font-size: 14pt;\"><img src=\"https:\/\/oss.matchpages.cn\/matchpages\/common\/2023\/1108\/6801\/654b4216aeddb\/activated-carbon-allcarbon.webp\" alt=\"activated carbon allcarbon \" width=\"900\" data-resolution=\"1806*396\" \/><\/span><\/strong><\/h2>\n<h2 style=\"line-height: 1.6;\"><strong><span style=\"color: #169179; font-size: 14pt;\">3) Why shouldn&rsquo;t you use too much activated carbon for decolorization?<\/span><\/strong><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(1) Activated carbon is generally added to between 0.5-5% of the solvent;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(2) Specific experiments must be done. Some adsorption of pigments is more obvious, while others are not obvious, and the effects of activated carbon on the content are also different;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(3) Before adding, dissolve the activated carbon in a small amount of solvent, stir evenly, then add it to the reaction, and then decolorize at a certain temperature;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(4) In addition, the pH value of the decolorizing solution also has a certain impact on decolorization. Generally, the decolorization effect will be better under acidic conditions. In addition, the activity and quality are also critical, so use one with strong decolorization power.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(5) Adding too much activated carbon not only causes waste but also causes activated carbon pollution.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(6) During activated carbon decolorization, it is best to do a small test first, and then conduct a pilot test based on the dosage of the small test, and then put it into operation after determining the dosage.<\/span><\/p>\n<h2 style=\"line-height: 1.6;\"><span style=\"color: #169179; font-size: 14pt;\"><strong>4) Specific steps for using activated carbon to decolorize vegetable oil:<\/strong> <\/span><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">Methods for decolorizing oils include solar decolorization (also known as oxidation method), chemical decolorization, heating and adsorption methods, etc.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(1) The adsorption method is to add certain substances with strong adsorption capacity (acidic activated clay, fuller's earth, activated carbon, etc.) to oil, and adsorb and remove pigments and other impurities (protein, mucus, resin, etc.) in the oil under heating. soap, etc.).<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">a. Intermittent decolorization means that the oil and adsorbent complete the decolorization process through one adsorption equilibrium in an intermittent state; <\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">b. The decolorized oil is transferred to the decolorization tank through the storage tank, heated and dried under vacuum, and mixed with the adsorbent sucked in from the adsorbent tank. Stir until fully contacted,<\/span><span style=\"color: #333333;\">complete the adsorption balance; <\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">c. Then pump the oil pump into the filter press to separate the adsorbent after cooling; <\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">d. After filtering, the decolored oil is collected into the storage tank, and transferred to the deodorization process by vacuum suction or oil pump. The adsorbent in the filter press is filtered The cake is transferred to the treatment tank to recover the residual oil.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(2) Adsorption and decolorization process parameters:<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">a. Deacidified oil quality: consumption index cooling water volume (20&deg;C, 0.3 MPa) 3.5 cubic meters\/ton of electricity (380 volts, 2206.5 watts, 50 Hz), 7 kilowatt hours\/ton of steam ( 1 MPa), 120 kg\/ton waste clay oil content &lt;35%;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">b. Protect workshop hygiene: the maximum allowable concentration of dust in the clay feeding room is 10 mg\/cubic meter;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">c. Exhaust gas emission: The maximum allowable dust concentration of the gas discharged to the outdoors from the clay conveying system is 150 mg\/cubic meter.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"><strong><span style=\"color: #2dc26b;\">\u203b Leaks and residues of white clay will occur after use.<\/span><\/strong> Because of its cost advantage, more white clay is used, and more of it flows to the refining section. Before the grease enters the packaging workshop, the residual clay must be filtered, which is very important to the quality of the finished product. big impact;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">\u203b Design filter bags with different combinations of filtration accuracy according to the requirements of each section of the enterprise to achieve a filtration flow rate and effect that matches the production requirements while ensuring cost advantages, capturing leaked clay and activated carbon, and ensuring the high quality of the finished oil;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"><strong><span style=\"color: #2dc26b;\">\u203b Activated clay is the most important adsorbent for decolorization and purification of edible oils:<\/span> <\/strong>there are two types of activated clay: natural active clay and activated clay treated with inorganic acid. The latter has stronger adsorption force because after appropriate acid treatment, the surface area of clay changes from the original 40 ~60m2\/g increases to 250~350m2\/g. <\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">After being treated with inorganic acid, the activated clay changes from neutral or weakly acidic to higher acidity, which is called acidic clay. It not only has strong adsorption activity, but also has The following obvious characteristics: solid acid properties; cation exchanger properties; acid catalyst properties; filter aid properties. Therefore, acid clay has many effects on oils and fats. The appropriate amount of adsorbent must be selected according to different oils and different requirements. and usage.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"><img src=\"https:\/\/oss.matchpages.cn\/matchpages\/common\/2024\/0110\/2172\/659e04f0ab2c8\/%E5%9B%BE%E7%89%874--2-.webp\" alt=\"properties of activated carbon \" width=\"900\" data-resolution=\"1266*422\" \/><\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">\u203b Activated carbon can be produced from a variety of carbon-containing raw materials (coal, wood, fruit shells, etc.). After high-temperature treatment, it is then activated with chemical activators (phosphoric acid, zinc oxide, etc.), air, and steam to increase its surface area and improve adsorption. active. <\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">This kind of activated carbon is often used together with activated clay to promote decolorization and purification of oils: activated carbon can effectively remove high-molecular polycyclic aromatic hydrocarbons that clay cannot adsorb (while the deodorization process can only remove low molecular weight polycyclic aromatic hydrocarbons containing 4 or less (polycyclic aromatic hydrocarbons), activated carbon has a particularly strong adsorption effect on polycyclic aromatic hydrocarbons. <\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">Even if the activated carbon filter cake is pressed, the filtered oil does not contain polycyclic aromatic hydrocarbons.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"><strong><span style=\"color: #2dc26b;\">\u203b The new decolorizing adsorbent uses water glass as raw material. <\/span><\/strong><span style=\"color: #2dc26b;\"><span style=\"color: #333333;\">After treatment with dilute sulfuric acid,<\/span><\/span> a special silica gel with a water content of 60% to 70% is prepared. Its specific surface area is very large (about 800m2\/g). This silica gel is suitable for Trace metal soaps and phospholipids have high activity and selective adsorption.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"><span style=\"color: #2dc26b;\"><strong>\u203b There are two methods of activated carbon decolorization:<\/strong><\/span> cold decolorization and thermal decolorization. Generally, thermal decolorization is commonly used, and the dosage of activated carbon is 0.2~0.5W.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">\u203b Activated carbon is divided into alkaline, neutral and acidic. Its decolorization effect is different depending on its preparation source and particle size.<\/span><\/p>\n<h2 style=\"line-height: 1.6;\"><span style=\"color: #169179; font-size: 14pt;\">5) Food decolorization activated carbon technology and principle<\/span><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(1) The adsorption of activated carbon for food decolorization is selective. Non-polar substances are easier to adsorb than polar substances. In the same series of substances, substances with higher boiling points are more likely to be adsorbed. The greater the pressure, the lower the temperature, and the greater the concentration. , the greater the adsorption capacity;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">On the contrary, reducing pressure and raising temperature are beneficial to gas desorption;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(2) Food decolorization activated carbon is often used for gas adsorption, separation and purification, solvent recovery, decolorizing agent for sugar liquid, grease, glycerin, drugs, deodorizer for drinking water and refrigerators, and poison filter in gas masks. Used as a carrier for catalysts or metal salt catalysts.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(3) Activated carbon has a microcrystalline structure. The arrangement of the microcrystals is completely irregular. There are micropores, transition pores (radius 20-1000), and macropores (radius 1000-100000) in the crystal, giving it a large inner surface. <\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">The surface area is 500-1700 square meters\/g, which determines that food decolorization activated carbon has good adsorption properties and can adsorb metal ions, harmful gases, organic pollutants, pigments, etc. in wastewater and waste gas;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(4) The industrial application of activated carbon also requires high mechanical strength and good wear resistance. Its structure should be stable and the energy required for adsorption should be small to facilitate regeneration;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(5) Food decolorization activated carbon can be used for decolorization and deodorization of oils, beverages, food, and drinking water.<\/span><\/p>","discuss":0,"seo_title":"Activated Carbon Decolorization Guide | ACC Activated Carbon Supplier","seo_keyword":"Activated Carbon,activated carbon for decolorization,properties of activated carbon","seo_describe":"What should we pay attention to when using activated carbon for decolorization? Why shouldnt you use too much activated carbon for decolorization?","track_code":"","viewer":"","source_copy_id":0,"sort":44,"status":0,"data_time":"2024-03-14 10:49:49","create_time":"2024-03-14 10:33:36","update_time":"2025-04-02 09:56:43","type_items":[{"id":2083,"website_id":781,"name":"Activated Carbon","urla":""}],"tag_items":[]}}

<h1 style="line-height: 1.6;"><strong>Activated Carbon Decolorization Guide</strong></h1>
<h2 style="line-height: 1.6;"><strong><span style="color: #169179; font-size: 14pt;">1) Determination method of decolorization power:</span></strong></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">(1) First prepare the Yalan standard solution that you need to use. There are two commonly used ones at present, 1.5g/l and 1.8g/l. Choose the standard solution according to your own needs;</span><br /><span style="color: #333333;">(2) Then prepare a 10 ml straw and a 50 ml tapered cup;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(3) Weigh 0.1g of activated carbon and place it in a tapered cup;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(4) Then use a pipette to suck up the alan standard solution, and determine how many milliliters to draw;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(5) Then pour the standard solution into the tapered cup, and then stir thoroughly for about 10-15 minutes;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(6) Finally, filter the stirred solution with filter paper, and judge the decolorization rate of activated carbon according to the color of the filtered water;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(7) It is best to use a oscillator when stirring, so that it is more uniform and the measurement results are better and more accurate!</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(8) If the alan concentration is 0.15, it should be 240mg/0.1g</span></p>
<h2 style="line-height: 1.6;"><strong><span style="color: #169179; font-size: 14pt;">2) What issues should be paid attention to when using activated carbon for decolorization?</span></strong></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">(1) The general operating temperature of activated carbon is 75-80 degrees;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(2) The decolorization effect of activated carbon is strongest in water, and it is also effective in strong polar solvents, but less effective in non-polar solvents;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(3) Generally, it is better to use it under pH 3-6 conditions;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(4) Under normal circumstances, the added amount is one to three thousandths;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(5) The decolorization time is generally 30-60 minutes;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(6) There are many types and models of activated carbon, such as sugar carbon, oil carbon, etc. You should choose an activated carbon suitable for your use;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(7) Do not add activated carbon to the boiling solution, as there is a risk of boiling;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(8) When using activated carbon for decolorization, the solid matter must be completely dissolved before adding it. Although colored impurities are soluble in boiling solvents, when the crystals are precipitated by cooling, some of the impurities will be adsorbed by the crystals, causing the product to be colored, so use Activated carbon for decolorization should be added after the solid matter is completely dissolved.</span></p>
<h2 style="line-height: 1.6;"><strong><span style="color: #169179; font-size: 14pt;"><img src="https://oss.matchpages.cn/matchpages/common/2023/1108/6801/654b4216aeddb/activated-carbon-allcarbon.webp" alt="activated carbon allcarbon " width="900" data-resolution="1806*396" /></span></strong></h2>
<h2 style="line-height: 1.6;"><strong><span style="color: #169179; font-size: 14pt;">3) Why shouldn’t you use too much activated carbon for decolorization?</span></strong></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">(1) Activated carbon is generally added to between 0.5-5% of the solvent;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(2) Specific experiments must be done. Some adsorption of pigments is more obvious, while others are not obvious, and the effects of activated carbon on the content are also different;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(3) Before adding, dissolve the activated carbon in a small amount of solvent, stir evenly, then add it to the reaction, and then decolorize at a certain temperature;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(4) In addition, the pH value of the decolorizing solution also has a certain impact on decolorization. Generally, the decolorization effect will be better under acidic conditions. In addition, the activity and quality are also critical, so use one with strong decolorization power.</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(5) Adding too much activated carbon not only causes waste but also causes activated carbon pollution.</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(6) During activated carbon decolorization, it is best to do a small test first, and then conduct a pilot test based on the dosage of the small test, and then put it into operation after determining the dosage.</span></p>
<h2 style="line-height: 1.6;"><span style="color: #169179; font-size: 14pt;"><strong>4) Specific steps for using activated carbon to decolorize vegetable oil:</strong> </span></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">Methods for decolorizing oils include solar decolorization (also known as oxidation method), chemical decolorization, heating and adsorption methods, etc.</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(1) The adsorption method is to add certain substances with strong adsorption capacity (acidic activated clay, fuller's earth, activated carbon, etc.) to oil, and adsorb and remove pigments and other impurities (protein, mucus, resin, etc.) in the oil under heating. soap, etc.).</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">a. Intermittent decolorization means that the oil and adsorbent complete the decolorization process through one adsorption equilibrium in an intermittent state; </span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">b. The decolorized oil is transferred to the decolorization tank through the storage tank, heated and dried under vacuum, and mixed with the adsorbent sucked in from the adsorbent tank. Stir until fully contacted,</span><span style="color: #333333;">complete the adsorption balance; </span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">c. Then pump the oil pump into the filter press to separate the adsorbent after cooling; </span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">d. After filtering, the decolored oil is collected into the storage tank, and transferred to the deodorization process by vacuum suction or oil pump. The adsorbent in the filter press is filtered The cake is transferred to the treatment tank to recover the residual oil.</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(2) Adsorption and decolorization process parameters:</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">a. Deacidified oil quality: consumption index cooling water volume (20°C, 0.3 MPa) 3.5 cubic meters/ton of electricity (380 volts, 2206.5 watts, 50 Hz), 7 kilowatt hours/ton of steam ( 1 MPa), 120 kg/ton waste clay oil content <35%;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">b. Protect workshop hygiene: the maximum allowable concentration of dust in the clay feeding room is 10 mg/cubic meter;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">c. Exhaust gas emission: The maximum allowable dust concentration of the gas discharged to the outdoors from the clay conveying system is 150 mg/cubic meter.</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;"><strong><span style="color: #2dc26b;">※ Leaks and residues of white clay will occur after use.</span></strong> Because of its cost advantage, more white clay is used, and more of it flows to the refining section. Before the grease enters the packaging workshop, the residual clay must be filtered, which is very important to the quality of the finished product. big impact;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">※ Design filter bags with different combinations of filtration accuracy according to the requirements of each section of the enterprise to achieve a filtration flow rate and effect that matches the production requirements while ensuring cost advantages, capturing leaked clay and activated carbon, and ensuring the high quality of the finished oil;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;"><strong><span style="color: #2dc26b;">※ Activated clay is the most important adsorbent for decolorization and purification of edible oils:</span> </strong>there are two types of activated clay: natural active clay and activated clay treated with inorganic acid. The latter has stronger adsorption force because after appropriate acid treatment, the surface area of clay changes from the original 40 ~60m2/g increases to 250~350m2/g. </span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">After being treated with inorganic acid, the activated clay changes from neutral or weakly acidic to higher acidity, which is called acidic clay. It not only has strong adsorption activity, but also has The following obvious characteristics: solid acid properties; cation exchanger properties; acid catalyst properties; filter aid properties. Therefore, acid clay has many effects on oils and fats. The appropriate amount of adsorbent must be selected according to different oils and different requirements. and usage.</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;"><img src="https://oss.matchpages.cn/matchpages/common/2024/0110/2172/659e04f0ab2c8/%E5%9B%BE%E7%89%874--2-.webp" alt="properties of activated carbon " width="900" data-resolution="1266*422" /></span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">※ Activated carbon can be produced from a variety of carbon-containing raw materials (coal, wood, fruit shells, etc.). After high-temperature treatment, it is then activated with chemical activators (phosphoric acid, zinc oxide, etc.), air, and steam to increase its surface area and improve adsorption. active. </span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">This kind of activated carbon is often used together with activated clay to promote decolorization and purification of oils: activated carbon can effectively remove high-molecular polycyclic aromatic hydrocarbons that clay cannot adsorb (while the deodorization process can only remove low molecular weight polycyclic aromatic hydrocarbons containing 4 or less (polycyclic aromatic hydrocarbons), activated carbon has a particularly strong adsorption effect on polycyclic aromatic hydrocarbons. </span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">Even if the activated carbon filter cake is pressed, the filtered oil does not contain polycyclic aromatic hydrocarbons.</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;"><strong><span style="color: #2dc26b;">※ The new decolorizing adsorbent uses water glass as raw material. </span></strong><span style="color: #2dc26b;"><span style="color: #333333;">After treatment with dilute sulfuric acid,</span></span> a special silica gel with a water content of 60% to 70% is prepared. Its specific surface area is very large (about 800m2/g). This silica gel is suitable for Trace metal soaps and phospholipids have high activity and selective adsorption.</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;"><span style="color: #2dc26b;"><strong>※ There are two methods of activated carbon decolorization:</strong></span> cold decolorization and thermal decolorization. Generally, thermal decolorization is commonly used, and the dosage of activated carbon is 0.2~0.5W.</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">※ Activated carbon is divided into alkaline, neutral and acidic. Its decolorization effect is different depending on its preparation source and particle size.</span></p>
<h2 style="line-height: 1.6;"><span style="color: #169179; font-size: 14pt;">5) Food decolorization activated carbon technology and principle</span></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">(1) The adsorption of activated carbon for food decolorization is selective. Non-polar substances are easier to adsorb than polar substances. In the same series of substances, substances with higher boiling points are more likely to be adsorbed. The greater the pressure, the lower the temperature, and the greater the concentration. , the greater the adsorption capacity;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">On the contrary, reducing pressure and raising temperature are beneficial to gas desorption;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(2) Food decolorization activated carbon is often used for gas adsorption, separation and purification, solvent recovery, decolorizing agent for sugar liquid, grease, glycerin, drugs, deodorizer for drinking water and refrigerators, and poison filter in gas masks. Used as a carrier for catalysts or metal salt catalysts.</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(3) Activated carbon has a microcrystalline structure. The arrangement of the microcrystals is completely irregular. There are micropores, transition pores (radius 20-1000), and macropores (radius 1000-100000) in the crystal, giving it a large inner surface. </span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">The surface area is 500-1700 square meters/g, which determines that food decolorization activated carbon has good adsorption properties and can adsorb metal ions, harmful gases, organic pollutants, pigments, etc. in wastewater and waste gas;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(4) The industrial application of activated carbon also requires high mechanical strength and good wear resistance. Its structure should be stable and the energy required for adsorption should be small to facilitate regeneration;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(5) Food decolorization activated carbon can be used for decolorization and deodorization of oils, beverages, food, and drinking water.</span></p>